👤

Calculati suma S=1/1×2+1/2×3+1/3×4+...+1/2008×2009=

Răspuns :

1/1-1/2+1/2-1/3+1/3-1/4+...+1/2008-1/2009 .... Se simplifica termenii asemenea..si rezulta 1/1-1/2009 = 2009/2009-1/2009=2008/2009